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3D background preparations and questions

Hi all, after many rescapes I'm just not satisfied any longer! I'm wanting to start the process in making a 3D background for my cichlid tank. But I have a few questions and obstacles that I'm facing. First, what are the best products? I've heard just regular styrofoam is your best option, but also have seen a lot of raves about spray foam. In regard to styrofoam people have been using the quickrete hydraulic, any issues with this? And I know with the concrete you have to allow your ph to sky rocket so it's best to not re add fish to the tank with out a great risk. Is there any way or products to minimize the ph? I don't have any other tank large enough to house my fish for a couple weeks. I mean I have a 30 gallon, but that will just create havoc. Also, if Using spray foam can you manipulate it and carve it like styrofoam? Lots of questions! Any advice? Thanks guys.

I've heard people have good luck using Drylock masonry sealer...it's not concrete so it doesn't impact pH...but they say it does give a nice base coat and texture to your carved foam background. Unless I find a better option before I do my own, that's the route I plan to follow.